Tensioning apparatus



Aug. 10, 1943. G. E. HENNING ET AL TENS IONING APPARATUS Filed Oct. 7,1942 2920x556 .rzmumwn 5 o9omonownuo uovooomo2 EGE ii Em mww N N a ameon M A mmziuzmw M om 4 mm mw Gd Y 1 Q ,wm

V 'Patented 3 i ing the-invention 3- -The1chain no engagesfafidfdrives'M 'fixedgto a shaft l a:u o wm h t e is o mg;

7 a atsprocktfl li cnam 4 5' driven "by-the "sprocket 1 eli mo ewMd-iasrsto We ie c ri \Company, Incorpprate'd,

corporation of lfIeez York Q,

This inveritiori relates to tensidiiin g" apparatus 7 erfinnmgitppawinings and more barticularly'toan apparatus 'for' appiy ing -aconstanttension toewee being drawn mm a spool rotating about the: axis'ofa constantly 1 advancing element to'wrap webpnifornflycn the element.7

I It is an object :of'the fbresentinrention top'r ovide a simple and'highly; effective" apparatu's'for maintaining the desired tension in'anelement beingapplidto'asecdnd element Inacccrd'arice with one embodimentof the in-r ventio'n, an apparatusis provided for maintain- V i 7 ingconstant tensio'nin alweb -being woiiridirom v a pad'or rollmountedcdrichtricallybfecon-r stantly advancing cable onto *s'aid cableThe constant tension is efiected by' utilizing the speed-torquecharacteristic of an indiiction type torque motor to apply; through aplanetary differential mechanism,- a torque tending lto rotate a spideron which the feed pad-or-rollis mount- "ed in e; direction oppositeto"the dire' ctior1';iri

which the motor which sdppl ies powerto-adiajrice the cable also tendsto i drive the pad through the difierential mechanism.1 A' highresistance induction type trquel motoryi's flirmjided' so that neeete-on n 'a piqer as; The'spider 3 1s v mo1inted on 2.5

the motor wili have the -properf speed-torque characteristic toapply aconstant-tension"to'the' strand.

r 'A completeunders tandihg[of thle inventidn' may be had by referencetofthe" following de "tailed description of'bne'efnbodimnt thereof;whenconsideredin cqnjunction withthe-accom a r Fig; 1 is a diagrammaticillnstratiorr ofjapre- [I ie'rred embodiment of the invention, and: '2 j1 152 a graphic =i111 1stration of; thes eem torque curve of aninduction'type torque motor suitable for use inithe present inv htiingthe'portion of said. curve utilized freely; rotatable gui e -rouerssag na'flo-iw ie suitable supply source- (not shown) fibyf'a capstan .10in the direction indicated by t he arrow'fl l'.

' sprocket-{12 ingma; second sprocket-1 vanbed *through; the at) be-ofranyxsuitabletyp :wellknown-i m-thear s pr cket aride sprocket?! fixed;on ahollo'wi. P shaft r:; 1 eeve 3s" en the I there is positioned a'ring d-gear;- 20' r r 1 1a s L s-"The is efi gaged b -ahemta whichefigag esthe m cable 6 ,is ;drawn by the capstan; I ri e'shartifie 'i 'e it1 v drives the*pad1| and thek'shaft is fsurroundedv mi w meme m t t rsh-MY V @f neieeemined speed by the iner 'thespeedf ofthe motor 91Intermediate the sprocket sprocketsftb abut. The sprocket 31 through a;chain 33',"a' sprocket 34; and a Variable speed apparat isbm :Zwhich nayerivesi procket-st t ma rrnined 'constaht j' speed." ;A- drivegchairi 3.6 5 iht'erconnect i the i hhhildidf whi h r V r o p rtifl A "tache'd tothe ring' g'ear support 39 emurre v nally 'toothedl 'riiig gear which"meshes with-I a pair of planetary gearg 4| and 42 mountedior shaft '44,the; axis of which cid'es {with th artist-"of a "shaft 7 p ane r ea A 5am 4 whe'iproq,

sprocket 49 of 'a high' resistance inductiontype ii vo r carries ffixed'130 [it a air of tatio ijibodily aboutfthek-axis eed 5 atFIWhiCh th ami e "cap te .-'Ii. mu =1. i .ln iwi enz yp r l have a knownspeed-tb'rqile characteristic whic f cuit such that its speed torquecurve is as shown diagrammatically in Fig. 2. That is, amotor may bechosen which has a torque of between 45 and 50 inch-pounds, at()% ofsynchronous speed and proportional to therate of speed of the flange-mernber' 58 carrying, the guide rollers 69' and" r 'la g fiowever,'sinceiit: is desiredmto ,-':drive I the pad Lana ratepfgspe'eddiiferentfronithe speed biz-the flange: m mb nafia; thevariableSpeeders? c'er l'glw-ill tend-tqzdriv v h n-pa d Jaihropgh thenlapetarygear system; at a rate'of is eedicong led by-=t1iespeed reducer-32Since:it,i s;prac-,

' r 'l;t sp edoi per f v u p 2,326,220 7 is dependent on 'theresistancevalue of the I p which has, zero; torqnetat 100% of' synehronous speed.;The torque output of sucha motor will, as indicated, vary at a knownrate with the variation in speed thereof if the applied voltage ismaintained at a constant value. g1 V In the: o'peration'of the apparatusas described hereinbefore, power being supplied; to fthe 5 main jdrivingmotor 9 and to theflinductionity'petorque mot0r 50 will; result in thecapstan 8 being driven;

at a predetermined rate f of speed through the,

speed reducer 22' which rate iof .:vspeed'aistdirectlyo 1 i btirveofthemotor '50be effective. For 'exam- ----;p ie that portion between thedotted lines designated full pad and empty pad may be sef-Theprov'ision'of the variable speed ap- 5 ap lyin a-Wfapping- 0' 2'5 c S ince themotor.

"I t iq e'aptqr connected b s e 1 h? %fi% i me eef e yinea arakm t rainhe withdrawa oima a om ;range;indicatedinFig; 2, ew sta n but; ii ,p

' 'lectedl' stopped? V Wh ri qlaiinediis material comprisi I Itransmitting t torque motor for I ar d 'e Tet w i'ri ingzagqi i ral;lean i h V s ets described hereinbefore oneto another; this the properportion or its speed torque curve for control. purposes in order toprovide a tension in theweb 5 within the desired limits. 1

L *If it jsjdesiredito vary t ens'ion ini the web that-a'difierentportion of the speed torque unusual stresses-are appliedto the web, suchas mayq occur' when t he' apparatus is started or i s srlsyse tin amentconcentrically. with resp ct to the s whi -s e d r du n -wrapp n qhansm j cr su p yi aid mea grisuppor the means. ifoiflsupe c, a n an iar -mqnnfie inatl esn ed-r u r-and t V G- -Emeansforcom ,efiet v n csz oi; heI a eta y gear rnechanisn mnder control ffthe'; torque; motor.

; v a 1 t p ii ll en n-to stiand j withdrawing strandgg aterialiromsaidnitatebh;

' meme e i in a i fr a ia .searl a g a power nput and ower output, said;powering; 'ec a cally coupled in fiXEd; ratio to said mean sl-, for;withdraw said pqvjer output; to intain a constant ten A tens oning'apparatuscomprising a rotatable support-for a supply-of material meansfor rornthe supply,

it, or nprising a difierential gear y mechanism- ;;for

H iiierential mechanism for mg power to thedifferentiai; mech-i a eztmee meter A A tensioning apparatus coringrising'airotat;

. i t .at ue y efieat r a i 111612115 for v t ahfrom the su p1 in-it;comatting ppwe tial; mechanism vthe variable speed apparatu's inay'bechanged thejwebilw hi e-the entire apparatus is oper-' .nna a s ceasin;gimme mate ialrgmeans f r 3 d; st 13and-- including r m..- a: r-

a ommonfimoto rotatable member for aersaana ancLa rorceipn said sup- Vtats the suppo i a torguetosaidimechf wnsb tweens WithdmW- I yrmeansSF-PDOIEIO' mi fbrftrans= il m tz-ai-torque U idemechamsm; flycouplinethe' miiandzthrough tc, drive the torque for-applying a brakingforce onsaid support to restrain the withdrawalofmaterial from it, com-'prising a differential gear-mechanism fortrans i mitting power to rotatethe support, a'torque moitc-r for applying a torque to said mechanism,and

' a driving connection for directly coupling the withdrawing means 'tosupplyrdriving power to thediiferential mechanism and through the dif--ferential mechanism to drive the torque motor 3 counter to its normaldriving direction. r

"6. An apparatus for ap'ply'irigtension to strand material, comprising arotatable member for holding a supply of strand material; means 'for i Ywithdrawing strand material from said rotatable member, means forrestraining-said rotatable i member including differentialgear'mech'anism' having'two power inputs'and one power output, I .i atorque motor'tending' to drive one of said power 7 inputs, a positivedriving connection between the withdrawing means andthe otherpower-input, v 1 r and mean'sinterconnecting' the power output and e therotatab-lesupport. 1 7. The combination with a rotatable support forholdinga supply of flexible material'wound; thereon, of a positivelydriven-means fonwith' drawing material from said {supplyfm eans re-'1straining movement of said rotatable supply inl-I eluding a torquemotor, a differential gear mech' f 'anism having a power output shaftdirectlyconnectedtothe rotatablesupport, a power'input] shaft positivelyconnected to the means for with .drawing material fromthe supply, and ashaftj positively connected-to said torquemotor to drive 1 said torquemotor in the reverse of its normal dii rection of drive.

8. The combination with a 'rotatable member for holding a supplyofstrand'materialiand means" 1 i for withdrawing strand material fromsaid rotat able member, of means for restraining said r0; tatablesupport comprising a; differential gear mechanismincluding spidersupport planet gears, a ring gear meshing withthe planet gears and a sungear meshing with said planet gears, a torque -motor positivelyconnected to' said sun gear;

means positively interconnecting said spider and therotat'able support,and means positively inter.-

. 7 connecting the ring gearwith'th'e means for withi V drawingthestrand material from the rotatable support. 7 I 1 9. TheQcombination of:a rotatable support-l, V 'member for, holding a supply of strandmaterialg and means for withdrawing strand material-from said-rotatablesupport member,. of means for restraining movement of said rotatablesupport- V 10 member comprising, adifferential gear mocha-Q x nismincluding-raring gear positively driven in fixed relation to theoperation of the mGEIRS fOI" withdrawing strand material, a pair ofplanet? v a l gears meshing with said ring gear, a spiderj for. 15rotatably supporting saidplanet gear and positively connected to saidrotatable support, asun gear meshing with saidiplanetgears, a torquejfImotor positively-connected to said sun gearforj I 'j tendingto'restrain the rotation of saidspidergo through the actionot theplanet'gears to apply a constant braking forcelto "therotatablej'support;

10, The combinationjor a rotatable support if i member-for holding a'supply of strand material. Y "and means for withdrawing strandmaterialfrom said rotatable "support fnember, of means for re"strainingimovement' of; said rotatable suppo'r membercoinprisingdifierential g'ear in'echa- I i nism including a ringgearpositively 1 driven in" fixedrelation to the operation of themeansfforwithdrawing strandjmaterial, 'aipairpfplatitk gears meshing with said'ringlgea rg a spider for L i rotatably'supporting said'lplanet gearsand posi tivelvconnectedtoi said rotatable-;support-,a' sun 1!geafmeshing with sa'id- I motor positivelyco-nnected: to said' sun gearfor: tending to restrain the rot'ation of said spider i through theaction -of thepianet sears to apply? "f aconstant braking'force-totherota-tablesupport, i saiditorque motor 'c'dnseduentlyrbeingdriverilin 1 1 4O ,afrevei se direction "tbj it's normaldirec'tion ofre} i :iv tation. at a varyingfs'peed controlled by the speed 'of therotatable support member. :f J

net. gears, a torque

